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+/****************************************************************************
+ *
+ * Program: HTTP plugin for Nagios
+ * License: GPL
+ *
+ * License Information:
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ *****************************************************************************/
+
+/****************************************************************************
+ *
+ * check_http is derived from the original check_http provided by
+ * Ethan Galstad/Karl DeBisschop
+ *
+ * This provides some additional functionality including:
+ * - check server certificate against supplied hostname (Host: header) if any
+ * - check server certificate against local CA certificates (as browsers do)
+ * - authenticate with client certificate (and optional passphrase)
+ * - specify HTTP returncodes to return a status of WARNING or OK instead of
+ * CRITICAL (only global for 3xx or 4xx errors)
+ * - check only against HTTP status line and exit immediately if not matched
+ *
+ *****************************************************************************/
+
+const char *progname = "check_http";
+#define REVISION "$Revision$"
+#define CVSREVISION "1.24"
+#define COPYRIGHT "2003"
+#define AUTHORS "Fabian Pehla"
+#define EMAIL "fabian@pehla.de"
+
+#include "config.h"
+#include "common.h"
+#include "netutils.h"
+#include "utils.h"
+
+
+#define HELP_TXT_SUMMARY "\
+This plugin tests the HTTP service on the specified host. It can test\n\
+normal (http) and secure (https) servers, follow redirects, search for\n\
+strings and regular expressions, check connection times, and report on\n\
+certificate expiration times.\n"
+
+#define HELP_TXT_OPTIONS "\
+-H <virtual host> -I <ip address> [-p <port>] [-u <uri>]\n\
+ [-w <warn time>] [-c <critical time>] [-t <timeout>]\n\
+ [-S] [-C <days>] [-a <basic auth>] [-A <certificate file>]\n\
+ [-Z <ca certificate file>] [-e <expect>] [-E <expect only>]\n\
+ [-s <string>] [-r <regex>] [-R <regex case insensitive>]\n\
+ [-f (ok|warn|critical|follow)] [-g (ok|warn|critical)]\n"
+
+#define HELP_TXT_LONGOPTIONS "\
+ -H, --hostname=<virtual host>\n\
+ FQDN host name argument for use in HTTP Host:-Header (virtual host)\n\
+ If used together wich the -S option, the server certificate will\n\
+ be checked against this hostname\n\
+ -I, --ip-address=<address>\n\
+ IP address or hostname for TCP connect (use IP to avoid DNS lookup)\n\
+ -p, --port=<port>\n\
+ Port number (default: %d)\n\
+ -u, --url-path=<uri>\n\
+ URL to request from host (default: %s)\n\
+ -S, --ssl\n\
+ Use SSL (default port: %d)\n\
+ -C, --server-certificate-days=<days>\n\
+ Minimum number of days a server certificate must be valid\n\
+ No other check can be combined with this option\n\
+ -a, --basic-auth=<username:password>\n\
+ Colon separated username and password for basic authentication\n\
+ -A, --client-certificate=<certificate file>\n\
+ File containing X509 client certificate and key\n\
+ -K, --passphrase=<passphrase>\n\
+ Passphrase for the client certificate key\n\
+ This option can only be used in combination with the -A option\n\
+ -Z, --ca-certificate=<certificate file>\n\
+ File containing certificates of trusted CAs\n\
+ The server certificate will be checked against these CAs\n\
+ -e, --http-expect=<expect string>\n\
+ String to expect in HTTP response line (Default: %s)\n\
+ -E, --http-expect-only=<expect only string>\n\
+ String to expect in HTTP response line\n\
+ No other checks are made, this either matches the response\n\
+ or exits immediately\n\
+ -s, --content-string=<string>\n\
+ String to expect in content\n\
+ -r, --content-ereg=<regex>\n\
+ Regular expression to expect in content\n\
+ -R, --content-eregi=<regex case insensitive>\n\
+ Case insensitive regular expression to expect in content\n\
+ -f, --onredirect=(ok|warning|critical|follow)\n\
+ Follow a redirect (3xx) or return with a user defined state\n\
+ Default: OK\n\
+ -g, --onerror=(ok|warning|critical)\n\
+ Status to return on a client error (4xx)\n\
+ -m, --min=INTEGER\n\
+ Minimum page size required (bytes)\n\
+ -t, --timeout=<timeout>\n\
+ Seconds before connection times out (default: %d)\n\
+ -c, --critical=<critical time>\n\
+ Response time to result in critical status (seconds)\n\
+ -w, --warning=<warn time>\n\
+ Response time to result in warning status (seconds)\n\
+ -V, --version\n\
+ Print version information\n\
+ -v, --verbose\n\
+ Show details for command-line debugging (do not use with nagios server)\n\
+ -h, --help\n\
+ Print detailed help screen\n"
+
+
+
+#define HTTP_PORT 80
+#define DEFAULT_HTTP_URL_PATH "/"
+#define DEFAULT_HTTP_EXPECT "HTTP/1."
+#define DEFAULT_HTTP_METHOD "GET"
+#define DEFAULT_HTTP_REDIRECT_STATE STATE_OK
+#define DEFAULT_HTTP_CLIENT_ERROR_STATE STATE_WARNING
+
+#define HTTP_TEMPLATE_REQUEST "%s%s %s HTTP/1.0\r\n"
+#define HTTP_TEMPLATE_HEADER_USERAGENT "%sUser-Agent: %s/%s (nagios-plugins %s)\r\n"
+#define HTTP_TEMPLATE_HEADER_HOST "%sHost: %s\r\n"
+#define HTTP_TEMPLATE_HEADER_AUTH "%sAuthorization: Basic %s\r\n"
+
+/* fill in printf with protocol_text(use_ssl), state_text(state), page->status, elapsed_time */
+#define RESULT_TEMPLATE_STATUS_RESPONSE_TIME "%s %s: %s - %7.3f seconds response time|time=%7.3f\n"
+#define RESULT_TEMPLATE_RESPONSE_TIME "%s %s: %7.3f seconds response time|time=%7.3f\n"
+
+#ifdef HAVE_SSL
+
+#ifdef HAVE_SSL_H
+#include <rsa.h>
+#include <crypto.h>
+#include <x509.h>
+#include <pem.h>
+#include <ssl.h>
+#include <err.h>
+#include <rand.h>
+#endif
+
+#ifdef HAVE_OPENSSL_SSL_H
+#include <openssl/rsa.h>
+#include <openssl/crypto.h>
+#include <openssl/x509.h>
+#include <openssl/pem.h>
+#include <openssl/ssl.h>
+#include <openssl/err.h>
+#include <openssl/rand.h>
+#endif
+
+#define HTTPS_PORT 443
+#endif
+
+#ifdef HAVE_REGEX_H
+#include <regex.h>
+#define REGEX_REGS 2
+#define MAX_REGEX_SIZE 256
+#endif
+
+#define chk_protocol(protocol) ( strstr( protocol, "https" ) ? TRUE : FALSE );
+#define protocol_std_port(use_ssl) ( use_ssl ? HTTPS_PORT : HTTP_PORT );
+#define protocol_text(use_ssl) ( use_ssl ? "HTTPS" : "HTTP" )
+
+#define MAX_IPV4_HOSTLENGTH 64
+#define HTTP_HEADER_LOCATION_MATCH "%*[Ll]%*[Oo]%*[Cc]%*[Aa]%*[Tt]%*[Ii]%*[Oo]%*[Nn]: "
+#define HTTP_HEADER_PROTOCOL_MATCH "%[HTPShtps]://"
+#define HTTP_HEADER_HOSTNAME_MATCH "%[a-zA-Z0-9.-]"
+#define HTTP_HEADER_PORT_MATCH ":%[0-9]"
+#define HTTP_HEADER_URL_PATH_MATCH "%[/a-zA-Z0-9._-=@,]"
+
+/*
+************************************************************************
+* GLOBAL VARIABLE/POINTER DEFINITIONS *
+************************************************************************
+*/
+
+/* misc variables */
+int verbose = FALSE;
+
+/* time thresholds to determine exit code */
+int use_warning_interval = FALSE;
+double warning_interval = 0;
+int use_critical_interval = FALSE;
+double critical_interval = 0;
+double elapsed_time = 0;
+struct timeval start_tv;
+
+/* variables concerning the server host */
+int use_server_hostname = FALSE;
+char *server_hostname = ""; // hostname for use in HTTPs Host: header
+char *server_host = ""; // hostname or ip address for tcp connect
+int use_server_port = FALSE;
+int server_port = HTTP_PORT;
+
+int use_basic_auth = FALSE;
+char basic_auth[MAX_INPUT_BUFFER] = "";
+
+/* variables concerning server responce */
+struct pageref {
+ char *content;
+ size_t size;
+ char *status;
+ char *header;
+ char *body;
+};
+
+/* variables concerning ssl connections */
+int use_ssl = FALSE;
+#ifdef HAVE_SSL
+int server_certificate_min_days_valid = 0;
+int check_server_certificate = FALSE;
+X509 *server_certificate; // structure containing server certificate
+int use_client_certificate = FALSE;
+char *client_certificate_file = NULL;
+int use_client_certificate_passphrase = FALSE;
+char *client_certificate_passphrase = NULL;
+int use_ca_certificate = FALSE;
+char *ca_certificate_file = NULL;
+
+BIO *bio_err = 0; // error write context
+#endif
+
+
+/* variables concerning check behaviour */
+char *http_method = DEFAULT_HTTP_METHOD;
+char *http_url_path = "";
+int use_http_post_data = FALSE;
+char *http_post_data = "";
+int use_min_content_length = FALSE;
+int min_content_length = 0;
+int use_http_expect_only = FALSE;
+char http_expect[MAX_INPUT_BUFFER] = DEFAULT_HTTP_EXPECT;
+int check_content_string = FALSE;
+char content_string[MAX_INPUT_BUFFER] = "";
+int http_redirect_state = DEFAULT_HTTP_REDIRECT_STATE;
+int http_client_error_state = DEFAULT_HTTP_CLIENT_ERROR_STATE;
+
+#ifdef HAVE_REGEX_H
+regex_t regex_preg;
+regmatch_t regex_pmatch[REGEX_REGS];
+int check_content_regex = FALSE;
+char content_regex[MAX_REGEX_SIZE] = "";
+int regex_cflags = REG_NOSUB | REG_EXTENDED | REG_NEWLINE;
+int regex_error = 0;
+char regex_error_buffer[MAX_INPUT_BUFFER] = "";
+#endif
+
+
+
+/*
+************************************************************************
+* FUNCTION PROTOTYPES *
+************************************************************************
+*/
+
+void print_usage( void );
+void print_help( void );
+int process_arguments (int, char **);
+int http_request( int sock, struct pageref *page);
+
+int parse_http_response( struct pageref *page );
+int check_http_response( struct pageref *page );
+int check_http_content( struct pageref *page );
+int prepare_follow_redirect( struct pageref *page );
+
+static char *base64 (char *bin, int len);
+
+#ifdef HAVE_SSL
+int ssl_terminate( int state, char *string );
+static int passwd_cb( char *buf, int num, int rwflag, void *userdata );
+static void sigpipe_handle( int x );
+SSL_CTX * initialize_ssl_ctx( void );
+void destroy_ssl_ctx( SSL_CTX *ctx );
+int fetch_server_certificate( SSL *ssl );
+int check_server_certificate_chain( SSL *ssl );
+int check_server_certificate_hostname( void );
+int check_server_certificate_expires( void );
+int https_request( SSL_CTX *ctx, SSL *ssl, struct pageref *page );
+#endif
+
+/*
+************************************************************************
+* IMPLEMENTATION *
+************************************************************************
+*/
+
+/*
+ * main()
+ *
+ * PSEUDOCODE OF HOW MAIN IS SUPPOSED TO WORK
+ *
+ * process command line arguments including sanity check
+ * initialize alarm signal handling
+ * if use_ssl
+ * build ssl context
+ * LOOP:
+ * make tcp connection
+ * if use_ssl
+ * make ssl connection
+ * if use_server_hostname
+ * check if certificate matches hostname
+ * if check_server_certificate
+ * check expiration date of server certificate
+ * return STATUS
+ * else
+ * request http page
+ * handle ssl rehandshake
+ * close ssl connection
+ * else
+ * request http page
+ * close tcp connection
+ * analyze http page
+ * if follow on redirect
+ * repeat LOOP
+ * end of LOOP
+ * destroy ssl context
+ */
+int
+main (int argc, char **argv)
+{
+ int result = STATE_UNKNOWN;
+ int sock;
+ struct pageref page;
+#ifdef HAVE_SSL
+ SSL_CTX *ctx;
+ SSL *ssl;
+ BIO *sbio;
+#endif
+
+ if ( process_arguments(argc, argv) == ERROR )
+ usage( "check_http: could not parse arguments\n" );
+
+#ifdef HAVE_SSL
+ /* build SSL context if required:
+ * a) either we use ssl from the beginning OR
+ * b) or we follor redirects wich may lead os to a ssl page
+ */
+ if ( use_ssl || ( http_redirect_state == STATE_DEPENDENT ) )
+ ctx=initialize_ssl_ctx();
+#endif
+
+ /* Loop around 3xx onredirect=follow */
+ do {
+
+ /*
+ * initialize alarm signal handling, set socket timeout, start timer
+ * socket_timeout and socket_timeout_alarm_handler are defined in
+ * netutils.c
+ */
+ (void) signal( SIGALRM, socket_timeout_alarm_handler );
+ (void) alarm( socket_timeout );
+ gettimeofday( &start_tv, NULL );
+
+ /* make a tcp connection */
+ result = my_tcp_connect( server_host, server_port, &sock );
+
+ /* result of tcp connect */
+ if ( result == STATE_OK )
+ {
+#ifdef HAVE_SSL
+ /* make a ssl connection */
+ if ( use_ssl ) {
+ ssl=SSL_new( ctx );
+ sbio=BIO_new_socket( sock, BIO_NOCLOSE );
+ SSL_set_bio( ssl, sbio, sbio);
+ if ( SSL_connect( ssl ) <= 0 )
+ ssl_terminate( STATE_CRITICAL, "check_http: SSL connect error" );
+
+ /* fetch server certificate */
+ result = fetch_server_certificate( ssl );
+
+ /* verify server certificate against CAs */
+ if ( ( result == STATE_OK ) && use_ca_certificate ) {
+ result = check_server_certificate_chain( ssl );
+ }
+
+ /* check if certificate matches hostname */
+ if ( ( result == STATE_OK ) && use_server_hostname ) {
+ result = check_server_certificate_hostname();
+ }
+
+ if ( result == STATE_OK ) {
+ /* check server certificate expire date */
+ if ( check_server_certificate ) {
+ result = check_server_certificate_expires();
+ /* OR: perform http request */
+ } else {
+ result = https_request( ctx, ssl, (struct pageref *) &page );
+ }
+ }
+ SSL_shutdown( ssl );
+ SSL_free( ssl );
+ } else {
+#endif
+ /* HTTP implementation */
+ result = http_request( sock, (struct pageref *) &page );
+#ifdef HAVE_SSL
+ }
+#endif
+ /* stop timer and calculate elapsed_time */
+ elapsed_time = delta_time( start_tv );
+
+ /* close the tcp connection */
+ close( sock );
+
+ /* reset the alarm */
+ alarm( 0 );
+
+ /* analyze http page */
+ /* TO DO */
+ if ( result == STATE_OK )
+ result = parse_http_response( (struct pageref *) &page );
+
+ if ( result == STATE_OK )
+ result = check_http_response( (struct pageref *) &page );
+
+ switch ( result ) {
+ case STATE_OK:
+ /* weiter geht's */
+ result = check_http_content( (struct pageref *) &page );
+ break;
+ case STATE_DEPENDENT:
+ /* try to determine redirect parameters */
+ result = prepare_follow_redirect( (struct pageref *) &page );
+ break;
+ }
+
+ } else {
+ /* some error occured while trying to make a tcp connect */
+ exit( result );
+ }
+
+ } while ( result == STATE_DEPENDENT ); // end of onredirect loop
+
+ /* destroy SSL context */
+#ifdef HAVE_SSL
+ if ( use_ssl || ( http_redirect_state == STATE_DEPENDENT ) )
+ destroy_ssl_ctx( ctx );
+#endif
+
+ /* if we ever get to this point, everything went fine */
+ printf( RESULT_TEMPLATE_STATUS_RESPONSE_TIME,
+ protocol_text( use_ssl ),
+ state_text( result ),
+ page.status,
+ elapsed_time,
+ elapsed_time );
+
+ return result;
+}
+
+
+void
+print_help( void )
+{
+ print_revision( progname, REVISION );
+ printf
+ ( "Copyright (c) %s %s <%s>\n\n%s\n",
+ COPYRIGHT, AUTHORS, EMAIL, HELP_TXT_SUMMARY );
+ print_usage();
+ printf( "NOTE: One or both of -H and -I must be specified\n" );
+ printf( "\nOptions:\n" HELP_TXT_LONGOPTIONS "\n",
+ HTTP_PORT, DEFAULT_HTTP_URL_PATH, HTTPS_PORT,
+ DEFAULT_HTTP_EXPECT, DEFAULT_SOCKET_TIMEOUT );
+#ifdef HAVE_SSL
+ //printf( SSLDESCRIPTION );
+#endif
+}
+
+
+void
+print_usage( void )
+{
+ printf( "Usage:\n" " %s %s\n"
+#ifdef HAVE_GETOPT_H
+ " %s (-h | --help) for detailed help\n"
+ " %s (-V | --version) for version information\n",
+#else
+ " %s -h for detailed help\n"
+ " %s -V for version information\n",
+#endif
+ progname, HELP_TXT_OPTIONS, progname, progname );
+}
+
+
+/*
+* process_arguments()
+*
+* process command line arguments either using getopt_long or getopt
+* (parsing long argumants manually)
+*/
+int
+process_arguments( int argc, char **argv )
+{
+ int c, i = 1;
+ extern char *optarg;
+
+#ifdef HAVE_GETOPT_H
+ int option_index = 0;
+ static struct option long_options[] = {
+ STD_LONG_OPTS,
+ {"file", required_argument, 0, 'F'},
+ {"ip-address", required_argument, 0, 'I'},
+ {"port", required_argument, 0, 'p'},
+ {"url-path", required_argument, 0, 'u'},
+ {"post-data", required_argument, 0, 'P'},
+ {"ssl", no_argument, 0, 'S'},
+ {"server-certificate-days", required_argument, 0, 'C'},
+ {"basic-auth", required_argument, 0, 'a'},
+ {"client-certificate", required_argument, 0, 'A'},
+ {"passphrase", required_argument, 0, 'K'},
+ {"ca-certificate", required_argument, 0, 'Z'},
+ {"http-expect", required_argument, 0, 'e'},
+ {"http-expect-only", required_argument, 0, 'E'},
+ {"content-string", required_argument, 0, 's'},
+ {"content-ereg-linespan", required_argument, 0, 'l'},
+ {"content-ereg", required_argument, 0, 'r'},
+ {"content-eregi", required_argument, 0, 'R'},
+ {"onredirect", required_argument, 0, 'f'},
+ {"onerror", required_argument, 0, 'g'},
+ {"min", required_argument, 0, 'm'},
+ {0, 0, 0, 0}
+ };
+#endif
+
+
+ /* convert commonly used arguments to their equivalent standard options */
+ for (c = 1; c < argc; c++) {
+ if ( strcmp( "-to", argv[c]) == 0 )
+ strcpy( argv[c], "-t" );
+ if ( strcmp( "-hn", argv[c]) == 0 )
+ strcpy( argv[c], "-H" );
+ if ( strcmp( "-wt", argv[c]) == 0 )
+ strcpy( argv[c], "-w" );
+ if ( strcmp( "-ct", argv[c]) == 0 )
+ strcpy( argv[c], "-c" );
+ }
+
+#define OPTCHARS "Vvht:c:w:H:F:I:p:u:P:SC:a:A:K:Z:e:E:s:r:R:f:g:lm:"
+
+
+ while (1) {
+
+#ifdef HAVE_GETOPT_H
+ c = getopt_long( argc, argv, OPTCHARS, long_options, &option_index );
+#else
+ c = getopt( argc, argv, OPTCHARS );
+#endif
+
+ if ( ( c == -1 ) || ( c == EOF ) ) {
+ break;
+ }
+
+ switch (c) {
+ case '?': /* usage */
+ usage2( "unknown argument", optarg );
+ break;
+
+ /* Standard options */
+ case 'h': /* help */
+ print_help();
+ exit( STATE_OK );
+ break;
+ case 'V': /* version */
+ print_revision( progname, REVISION );
+ exit( STATE_OK );
+ break;
+ case 'v': /* verbose */
+ verbose = TRUE;
+ break;
+ case 't': /* timeout period */
+ if ( !is_intnonneg( optarg ) )
+ usage2( "timeout interval must be a non-negative integer", optarg );
+ /* socket_timeout is defined in netutils.h and defaults to
+ * DEFAULT_SOCKET_TIMEOUT from common.h
+ */
+ socket_timeout = atoi( optarg );
+ break;
+ case 'c': /* critical time threshold */
+ if ( !is_nonnegative( optarg ) )
+ usage2( "invalid critical threshold", optarg );
+ critical_interval = strtod( optarg, NULL );
+ use_critical_interval = TRUE;
+ break;
+ case 'w': /* warning time threshold */
+ if ( !is_nonnegative( optarg ) )
+ usage2( "invalid warning threshold", optarg );
+ warning_interval = strtod( optarg, NULL );
+ use_warning_interval = TRUE;
+ break;
+ case 'H': /* Host Name (virtual host) */
+ /* this rejects FQDNs, so we leave it for now...
+ *if ( !is_hostname( optarg ) )
+ * usage2( "invalid hostname", optarg );
+ */
+ asprintf( &server_hostname, "%s", optarg );
+ use_server_hostname = TRUE;
+ break;
+ case 'F': /* File (dummy) */
+ break;
+ /* End of standard options */
+
+
+ case 'I': /* Server IP-address or Hostname */
+ /* this rejects FQDNs, so we leave it for now...
+ *if ( !is_host( optarg ) )
+ * usage2( "invalid ip address or hostname", optarg )
+ */
+ asprintf( &server_host, "%s", optarg );
+ break;
+ case 'p': /* Server port */
+ if ( !is_intnonneg( optarg ) )
+ usage2( "invalid port number", optarg );
+ server_port = atoi( optarg );
+ use_server_port = TRUE;
+ break;
+ case 'S': /* use SSL */
+#ifdef HAVE_SSL
+ use_ssl = TRUE;
+ if ( use_server_port == FALSE )
+ server_port = HTTPS_PORT;
+#else
+ usage( "check_http: invalid option - SSL is not available\n" );
+#endif
+ break;
+ case 'C': /* Server certificate warning time threshold */
+#ifdef HAVE_SSL
+ if ( !is_intnonneg( optarg ) )
+ usage2( "invalid certificate expiration period", optarg );
+ server_certificate_min_days_valid = atoi( optarg );
+ check_server_certificate = TRUE;
+#else
+ usage( "check_http: invalid option - SSL is not available\n" );
+#endif
+ break;
+ case 'a': /* basic authorization info */
+ strncpy( basic_auth, optarg, MAX_INPUT_BUFFER - 1 );
+ basic_auth[MAX_INPUT_BUFFER - 1] = 0;
+ use_basic_auth = TRUE;
+ break;
+ case 'A': /* client certificate */
+#ifdef HAVE_SSL
+ asprintf( &client_certificate_file, "%s", optarg );
+ use_client_certificate = TRUE;
+#else
+ usage( "check_http: invalid option - SSL is not available\n" );
+#endif
+ break;
+ case 'K': /* client certificate passphrase */
+#ifdef HAVE_SSL
+ asprintf( &client_certificate_passphrase, "%s", optarg );
+ use_client_certificate_passphrase = TRUE;
+#else
+ usage( "check_http: invalid option - SSL is not available\n" );
+#endif
+ case 'Z': /* valid CA certificates */
+#ifdef HAVE_SSL
+ asprintf( &ca_certificate_file, "%s", optarg );
+ use_ca_certificate = TRUE;
+#else
+ usage( "check_http: invalid option - SSL is not available\n" );
+#endif
+ break;
+ case 'u': /* URL PATH */
+ asprintf( &http_url_path, "%s", optarg );
+ break;
+ case 'P': /* POST DATA */
+ asprintf( &http_post_data, "%s", optarg );
+ use_http_post_data = TRUE;
+ asprintf( &http_method, "%s", "POST" );
+ break;
+ case 'e': /* expected string in first line of HTTP response */
+ strncpy( http_expect , optarg, MAX_INPUT_BUFFER - 1 );
+ http_expect[MAX_INPUT_BUFFER - 1] = 0;
+ break;
+ case 'E': /* expected string in first line of HTTP response and process no other check*/
+ strncpy( http_expect , optarg, MAX_INPUT_BUFFER - 1 );
+ http_expect[MAX_INPUT_BUFFER - 1] = 0;
+ use_http_expect_only = TRUE;
+ break;
+ case 's': /* expected (sub-)string in content */
+ strncpy( content_string , optarg, MAX_INPUT_BUFFER - 1 );
+ content_string[MAX_INPUT_BUFFER - 1] = 0;
+ check_content_string = TRUE;
+ break;
+ case 'l': /* regex linespan */
+#ifdef HAVE_REGEX_H
+ regex_cflags &= ~REG_NEWLINE;
+#else
+ usage( "check_http: call for regex which was not a compiled option\n" );
+#endif
+ break;
+ case 'R': /* expected case insensitive regular expression in content */
+#ifdef HAVE_REGEX_H
+ regex_cflags |= REG_ICASE;
+#else
+ usage( "check_http: call for regex which was not a compiled option\n" );
+#endif
+ case 'r': /* expected regular expression in content */
+#ifdef HAVE_REGEX_H
+ strncpy( content_regex , optarg, MAX_REGEX_SIZE - 1 );
+ content_regex[MAX_REGEX_SIZE - 1] = 0;
+ check_content_regex = TRUE;
+ regex_error = regcomp( &regex_preg, content_regex, regex_cflags );
+ if ( regex_error != 0 ) {
+ regerror( regex_error, &regex_preg, regex_error_buffer, MAX_INPUT_BUFFER );
+ printf( "Could Not Compile Regular Expression: %s", regex_error_buffer );
+ return ERROR;
+ }
+#else
+ usage( "check_http: call for regex which was not a compiled option\n" );
+#endif
+ break;
+ case 'f': /* onredirect (3xx errors) */
+ if ( !strcmp( optarg, "follow" ) )
+ http_redirect_state = STATE_DEPENDENT;
+ if ( !strcmp( optarg, "unknown" ) )
+ http_redirect_state = STATE_UNKNOWN;
+ if ( !strcmp( optarg, "ok" ) )
+ http_redirect_state = STATE_OK;
+ if ( !strcmp( optarg, "warning" ) )
+ http_redirect_state = STATE_WARNING;
+ if ( !strcmp( optarg, "critical" ) )
+ http_redirect_state = STATE_CRITICAL;
+ break;
+ case 'g': /* onerror (4xx errors) */
+ if ( !strcmp( optarg, "unknown" ) )
+ http_client_error_state = STATE_UNKNOWN;
+ if ( !strcmp( optarg, "ok" ) )
+ http_client_error_state = STATE_OK;
+ if ( !strcmp( optarg, "warning" ) )
+ http_client_error_state = STATE_WARNING;
+ if ( !strcmp( optarg, "critical" ) )
+ http_client_error_state = STATE_CRITICAL;
+ break;
+ case 'm': /* min */
+ if ( !is_intnonneg( optarg ) )
+ usage2( "invalid page size", optarg );
+ min_content_length = atoi( optarg );
+ use_min_content_length = TRUE;
+ break;
+ } // end switch
+ } // end while(1)
+
+ c = optind;
+
+
+ /* Sanity checks on supplied command line arguments */
+
+ /* 1. if both host and hostname are not defined, try to
+ * fetch one more argument which is possibly supplied
+ * without an option
+ */
+ if ( ( strcmp( server_host, "" ) ) && (c < argc) ) {
+ asprintf( &server_host, "%s", argv[c++] );
+ }
+
+ /* 2. check if another artument is supplied
+ */
+ if ( ( strcmp( server_hostname, "" ) == 0 ) && (c < argc) ) {
+ asprintf( &server_hostname, "%s", argv[c++] );
+ }
+
+ /* 3. if host is still not defined, just copy hostname,
+ * which is then guaranteed to be defined by now
+ */
+ if ( strcmp( server_host, "") == 0 ) {
+ if ( strcmp( server_hostname, "" ) == 0 ) {
+ usage ("check_http: you must specify a server address or host name\n");
+ } else {
+ asprintf( &server_host, "%s", server_hostname );
+ }
+ }
+
+ /* 4. check if content checks for a string and a regex
+ * are requested for only one of both is possible at
+ * a time
+ */
+ if ( check_content_string && check_content_regex )
+ usage( "check_http: you can only check for string OR regex at a time\n" );
+
+ /* 5. check for options which require use_ssl */
+ if ( check_server_certificate && !use_ssl )
+ usage( "check_http: you must use -S to check server certificate\n" );
+ if ( use_client_certificate && !use_ssl )
+ usage( "check_http: you must use -S to authenticate with a client certificate\n" );
+ if ( use_ca_certificate && !use_ssl )
+ usage( "check_http: you must use -S to check server certificate against CA certificates\n" );
+
+ /* 6. check for passphrase without client certificate */
+ if ( use_client_certificate_passphrase && !use_client_certificate )
+ usage( "check_http: you must supply a client certificate to use a passphrase\n" );
+
+
+ /* Finally set some default values if necessary */
+ if ( strcmp( http_method, "" ) == 0 )
+ asprintf( &http_method, "%s", DEFAULT_HTTP_METHOD );
+ if ( strcmp( http_url_path, "" ) == 0 ) {
+ asprintf( &http_url_path, "%s", DEFAULT_HTTP_URL_PATH );
+ }
+
+ return TRUE;
+}
+
+
+int
+http_request( int sock, struct pageref *page )
+{
+ char *buffer = "";
+ char recvbuff[MAX_INPUT_BUFFER] = "";
+ int buffer_len = 0;
+ int content_len = 0;
+ size_t sendsize = 0;
+ size_t recvsize = 0;
+ char *content = "";
+ size_t size = 0;
+ char *basic_auth_encoded = NULL;
+
+ asprintf( &buffer, HTTP_TEMPLATE_REQUEST, buffer, http_method, http_url_path );
+
+ asprintf( &buffer, HTTP_TEMPLATE_HEADER_USERAGENT, buffer, progname, REVISION, PACKAGE_VERSION );
+
+ if ( use_server_hostname ) {
+ asprintf( &buffer, HTTP_TEMPLATE_HEADER_HOST, buffer, server_hostname );
+ }
+
+ if ( use_basic_auth ) {
+ basic_auth_encoded = base64( basic_auth, strlen( basic_auth ) );
+ asprintf( &buffer, HTTP_TEMPLATE_HEADER_AUTH, buffer, basic_auth_encoded );
+ }
+
+ /* either send http POST data */
+ if ( use_http_post_data ) {
+ /* based on code written by Chris Henesy <lurker@shadowtech.org> */
+ asprintf( &buffer, "Content-Type: application/x-www-form-urlencoded\r\n" );
+ asprintf( &buffer, "Content-Length: %i\r\n\r\n", buffer, content_len );
+ asprintf( &buffer, "%s%s%s", buffer, http_post_data, "\r\n" );
+ sendsize = send( sock, buffer, strlen( buffer ), 0 );
+ if ( sendsize < strlen( buffer ) ) {
+ printf( "ERROR: Incomplete write\n" );
+ return STATE_CRITICAL;
+ }
+ /* or just a newline */
+ } else {
+ asprintf( &buffer, "%s%s", buffer, "\r\n" );
+ sendsize = send( sock, buffer, strlen( buffer ) , 0 );
+ if ( sendsize < strlen( buffer ) ) {
+ printf( "ERROR: Incomplete write\n" );
+ return STATE_CRITICAL;
+ }
+ }
+
+
+ /* read server's response */
+
+ do {
+ recvsize = recv( sock, recvbuff, MAX_INPUT_BUFFER - 1, 0 );
+ if ( recvsize > (size_t) 0 ) {
+ recvbuff[recvsize] = '\0';
+ asprintf( &content, "%s%s", content, recvbuff );
+ size += recvsize;
+ }
+ } while ( recvsize > (size_t) 0 );
+
+ asprintf( &page->content, "%s", content );
+ page->size = size;
+
+ /* return a CRITICAL status if we couldn't read any data */
+ if ( size == (size_t) 0)
+ ssl_terminate( STATE_CRITICAL, "No data received" );
+
+ return STATE_OK;
+}
+
+
+int
+parse_http_response( struct pageref *page )
+{
+ char *content = ""; //local copy of struct member
+ char *status = ""; //local copy of struct member
+ char *header = ""; //local copy of struct member
+ size_t len = 0; //temporary used
+ char *pos = ""; //temporary used
+
+ asprintf( &content, "%s", page->content );
+
+ /* find status line and null-terminate it */
+ // copy content to status
+ status = content;
+
+ // find end of status line and copy pointer to pos
+ content += (size_t) strcspn( content, "\r\n" );
+ pos = content;
+
+ // advance content pointer behind the newline of status line
+ content += (size_t) strspn( content, "\r\n" );
+
+ // null-terminate status line at pos
+ status[strcspn( status, "\r\n")] = 0;
+ strip( status );
+
+ // copy final status to struct member
+ page->status = status;
+
+
+ /* find header and null-terminate it */
+ // copy remaining content to header
+ header = content;
+
+ // loop until line containing only newline is found (end of header)
+ while ( strcspn( content, "\r\n" ) > 0 ) {
+ //find end of line and copy pointer to pos
+ content += (size_t) strcspn( content, "\r\n" );
+ pos = content;
+
+ if ( ( strspn( content, "\r" ) == 1 && strspn( content, "\r\n" ) >= 2 ) ||
+ ( strspn( content, "\n" ) == 1 && strspn( content, "\r\n" ) >= 2 ) )
+ content += (size_t) 2;
+ else
+ content += (size_t) 1;
+ }
+ // advance content pointer behind the newline
+ content += (size_t) strspn( content, "\r\n" );
+
+ // null-terminate header at pos
+ header[pos - header] = 0;
+
+ // copy final header to struct member
+ page->header = header;
+
+
+ // copy remaining content to body
+ page->body = content;
+
+ if ( verbose ) {
+ printf( "STATUS: %s\n", page->status );
+ printf( "HEADER: \n%s\n", page->header );
+ printf( "BODY: \n%s\n", page->body );
+ }
+
+ return STATE_OK;
+}
+
+
+int
+check_http_response( struct pageref *page )
+{
+ char *msg = "";
+
+ /* check response time befor anything else */
+ if ( use_critical_interval && ( elapsed_time > critical_interval ) ) {
+ asprintf( &msg, RESULT_TEMPLATE_RESPONSE_TIME,
+ protocol_text( use_ssl ),
+ state_text( STATE_CRITICAL ),
+ elapsed_time,
+ elapsed_time );
+ terminate( STATE_CRITICAL, msg );
+ }
+ if ( use_warning_interval && ( elapsed_time > warning_interval ) ) {
+ asprintf( &msg, RESULT_TEMPLATE_RESPONSE_TIME,
+ protocol_text( use_ssl ),
+ state_text( STATE_WARNING ),
+ elapsed_time,
+ elapsed_time );
+ terminate( STATE_WARNING, msg );
+ }
+
+
+ /* make sure the status line matches the response we are looking for */
+ if ( strstr( page->status, http_expect ) ) {
+ /* The result is only checked against the expected HTTP status line,
+ so exit immediately after this check */
+ if ( use_http_expect_only ) {
+ if ( ( server_port == HTTP_PORT )
+#ifdef HAVE_SSL
+ || ( server_port == HTTPS_PORT ) )
+#else
+ )
+#endif
+ asprintf( &msg, "Expected HTTP response received from host\n" );
+ else
+ asprintf( &msg, "Expected HTTP response received from host on port %d\n", server_port );
+ terminate( STATE_OK, msg );
+ }
+ } else {
+ if ( ( server_port == HTTP_PORT )
+#ifdef HAVE_SSL
+ || ( server_port == HTTPS_PORT ) )
+#else
+ )
+#endif
+ asprintf( &msg, "Invalid HTTP response received from host\n" );
+ else
+ asprintf( &msg, "Invalid HTTP response received from host on port %d\n", server_port );
+ terminate( STATE_CRITICAL, msg );
+ }
+
+ /* check the return code */
+ /* server errors result in a critical state */
+ if ( strstr( page->status, "500" ) ||
+ strstr( page->status, "501" ) ||
+ strstr( page->status, "502" ) ||
+ strstr( page->status, "503" ) ||
+ strstr( page->status, "504" ) ||
+ strstr( page->status, "505" )) {
+ asprintf( &msg, RESULT_TEMPLATE_STATUS_RESPONSE_TIME,
+ protocol_text( use_ssl ),
+ state_text( http_client_error_state ),
+ page->status,
+ elapsed_time,
+ elapsed_time );
+ terminate( STATE_CRITICAL, msg );
+ }
+
+ /* client errors result in a warning state */
+ if ( strstr( page->status, "400" ) ||
+ strstr( page->status, "401" ) ||
+ strstr( page->status, "402" ) ||
+ strstr( page->status, "403" ) ||
+ strstr( page->status, "404" ) ||
+ strstr( page->status, "405" ) ||
+ strstr( page->status, "406" ) ||
+ strstr( page->status, "407" ) ||
+ strstr( page->status, "408" ) ||
+ strstr( page->status, "409" ) ||
+ strstr( page->status, "410" ) ||
+ strstr( page->status, "411" ) ||
+ strstr( page->status, "412" ) ||
+ strstr( page->status, "413" ) ||
+ strstr( page->status, "414" ) ||
+ strstr( page->status, "415" ) ||
+ strstr( page->status, "416" ) ||
+ strstr( page->status, "417" ) ) {
+ asprintf( &msg, RESULT_TEMPLATE_STATUS_RESPONSE_TIME,
+ protocol_text( use_ssl ),
+ state_text( http_client_error_state ),
+ page->status,
+ elapsed_time,
+ elapsed_time );
+ terminate( http_client_error_state, msg );
+ }
+
+ /* check redirected page if specified */
+ if (strstr( page->status, "300" ) ||
+ strstr( page->status, "301" ) ||
+ strstr( page->status, "302" ) ||
+ strstr( page->status, "303" ) ||
+ strstr( page->status, "304" ) ||
+ strstr( page->status, "305" ) ||
+ strstr( page->status, "306" ) ||
+ strstr( page->status, "307" ) ) {
+ if ( http_redirect_state == STATE_DEPENDENT ) {
+ /* returning STATE_DEPENDENT means follow redirect */
+ return STATE_DEPENDENT;
+ } else {
+ asprintf( &msg, RESULT_TEMPLATE_STATUS_RESPONSE_TIME,
+ protocol_text( use_ssl ),
+ state_text( http_redirect_state ),
+ page->status,
+ elapsed_time,
+ elapsed_time );
+ terminate( http_redirect_state, msg );
+ }
+ }
+
+ return STATE_OK;
+}
+
+int
+check_http_content( struct pageref *page )
+{
+ char *msg = "";
+
+ /* check for string in content */
+ if ( check_content_string ) {
+ if ( strstr( page->content, content_string ) ) {
+ asprintf( &msg, RESULT_TEMPLATE_STATUS_RESPONSE_TIME,
+ protocol_text( use_ssl ),
+ state_text( STATE_OK ),
+ page->status,
+ elapsed_time,
+ elapsed_time );
+ terminate( STATE_OK, msg );
+ } else {
+ asprintf( &msg, RESULT_TEMPLATE_STATUS_RESPONSE_TIME,
+ protocol_text( use_ssl ),
+ state_text( STATE_CRITICAL ),
+ page->status,
+ elapsed_time,
+ elapsed_time );
+ terminate( STATE_CRITICAL, msg );
+ }
+ }
+
+#ifdef HAVE_REGEX_H
+ /* check for regex in content */
+ if ( check_content_regex ) {
+ regex_error = regexec( &regex_preg, page->content, REGEX_REGS, regex_pmatch, 0);
+ if ( regex_error == 0 ) {
+ asprintf( &msg, RESULT_TEMPLATE_STATUS_RESPONSE_TIME,
+ protocol_text( use_ssl ),
+ state_text( STATE_OK ),
+ page->status,
+ elapsed_time,
+ elapsed_time );
+ terminate( STATE_OK, msg );
+ } else {
+ if ( regex_error == REG_NOMATCH ) {
+ asprintf( &msg, "%s, %s: regex pattern not found\n",
+ protocol_text( use_ssl) ,
+ state_text( STATE_CRITICAL ) );
+ terminate( STATE_CRITICAL, msg );
+ } else {
+ regerror( regex_error, &regex_preg, regex_error_buffer, MAX_INPUT_BUFFER);
+ asprintf( &msg, "%s %s: Regex execute Error: %s\n",
+ protocol_text( use_ssl) ,
+ state_text( STATE_CRITICAL ),
+ regex_error_buffer );
+ terminate( STATE_CRITICAL, msg );
+ }
+ }
+ }
+#endif
+
+ return STATE_OK;
+}
+
+
+int
+prepare_follow_redirect( struct pageref *page )
+{
+ char *header = NULL;
+ char *msg = "";
+ char protocol[6];
+ char hostname[MAX_IPV4_HOSTLENGTH];
+ char port[6];
+ char *url_path = NULL;
+ char *orig_url_path = NULL;
+ char *orig_url_dirname = NULL;
+ size_t len = 0;
+
+ asprintf( &header, "%s", page->header );
+
+
+ /* restore some default values */
+ use_http_post_data = FALSE;
+ asprintf( &http_method, "%s", DEFAULT_HTTP_METHOD );
+
+ /* copy url of original request, maybe we need it to compose
+ absolute url from relative Location: header */
+ asprintf( &orig_url_path, "%s", http_url_path );
+
+ while ( strcspn( header, "\r\n" ) > (size_t) 0 ) {
+ url_path = realloc( url_path, (size_t) strcspn( header, "\r\n" ) );
+ if ( url_path == NULL )
+ terminate( STATE_UNKNOWN, "HTTP UNKNOWN: could not reallocate url_path" );
+
+
+ /* Try to find a Location header combination of METHOD HOSTNAME PORT and PATH */
+ /* 1. scan for Location: http[s]://hostname:port/path */
+ if ( sscanf ( header, HTTP_HEADER_LOCATION_MATCH HTTP_HEADER_PROTOCOL_MATCH HTTP_HEADER_HOSTNAME_MATCH HTTP_HEADER_PORT_MATCH HTTP_HEADER_URL_PATH_MATCH, &protocol, &hostname, &port, url_path ) == 4 ) {
+ asprintf( &server_hostname, "%s", hostname );
+ asprintf( &server_host, "%s", hostname );
+ use_ssl = chk_protocol(protocol);
+ server_port = atoi( port );
+ asprintf( &http_url_path, "%s", url_path );
+ return STATE_DEPENDENT;
+ }
+ else if ( sscanf ( header, HTTP_HEADER_LOCATION_MATCH HTTP_HEADER_PROTOCOL_MATCH HTTP_HEADER_HOSTNAME_MATCH HTTP_HEADER_URL_PATH_MATCH, &protocol, &hostname, url_path ) == 3) {
+ asprintf( &server_hostname, "%s", hostname );
+ asprintf( &server_host, "%s", hostname );
+ use_ssl = chk_protocol(protocol);
+ server_port = protocol_std_port(use_ssl);
+ asprintf( &http_url_path, "%s", url_path );
+ return STATE_DEPENDENT;
+ }
+ else if ( sscanf ( header, HTTP_HEADER_LOCATION_MATCH HTTP_HEADER_PROTOCOL_MATCH HTTP_HEADER_HOSTNAME_MATCH HTTP_HEADER_PORT_MATCH, &protocol, &hostname, &port ) == 3) {
+ asprintf( &server_hostname, "%s", hostname );
+ asprintf( &server_host, "%s", hostname );
+ use_ssl = chk_protocol(protocol);
+ server_port = atoi( port );
+ asprintf( &http_url_path, "%s", DEFAULT_HTTP_URL_PATH );
+ return STATE_DEPENDENT;
+ }
+ else if ( sscanf ( header, HTTP_HEADER_LOCATION_MATCH HTTP_HEADER_PROTOCOL_MATCH HTTP_HEADER_HOSTNAME_MATCH, protocol, hostname ) == 2 ) {
+ asprintf( &server_hostname, "%s", hostname );
+ asprintf( &server_host, "%s", hostname );
+ use_ssl = chk_protocol(protocol);
+ server_port = protocol_std_port(use_ssl);
+ asprintf( &http_url_path, "%s", DEFAULT_HTTP_URL_PATH );
+ }
+ else if ( sscanf ( header, HTTP_HEADER_LOCATION_MATCH HTTP_HEADER_URL_PATH_MATCH, url_path ) == 1 ) {
+ /* check for relative url and prepend path if necessary */
+ if ( ( url_path[0] != '/' ) && ( orig_url_dirname = strrchr( orig_url_path, '/' ) ) ) {
+ *orig_url_dirname = '\0';
+ asprintf( &http_url_path, "%s%s", orig_url_path, url_path );
+ } else {
+ asprintf( &http_url_path, "%s", url_path );
+ }
+ return STATE_DEPENDENT;
+ }
+ header += (size_t) strcspn( header, "\r\n" );
+ header += (size_t) strspn( header, "\r\n" );
+ } /* end while (header) */
+
+
+ /* default return value is STATE_DEPENDENT to continue looping in main() */
+ asprintf( &msg, "% %: % - Could not find redirect Location",
+ protocol_text( use_ssl ),
+ state_text( STATE_UNKNOWN ),
+ page->status );
+ terminate( STATE_UNKNOWN, msg );
+}
+
+#ifdef HAVE_SSL
+int
+https_request( SSL_CTX *ctx, SSL *ssl, struct pageref *page )
+{
+ char *buffer = "";
+ char recvbuff[MAX_INPUT_BUFFER] = "";
+ int buffer_len = 0;
+ int content_len = 0;
+ size_t sendsize = 0;
+ size_t recvsize = 0;
+ char *content = "";
+ size_t size = 0;
+ char *basic_auth_encoded = NULL;
+
+ asprintf( &buffer, HTTP_TEMPLATE_REQUEST, buffer, http_method, http_url_path );
+
+ asprintf( &buffer, HTTP_TEMPLATE_HEADER_USERAGENT, buffer, progname, REVISION, PACKAGE_VERSION );
+
+ if ( use_server_hostname ) {
+ asprintf( &buffer, HTTP_TEMPLATE_HEADER_HOST, buffer, server_hostname );
+ }
+
+ if ( use_basic_auth ) {
+ basic_auth_encoded = base64( basic_auth, strlen( basic_auth ) );
+ asprintf( &buffer, HTTP_TEMPLATE_HEADER_AUTH, buffer, basic_auth_encoded );
+ }
+
+ /* either send http POST data */
+ if ( use_http_post_data ) {
+ asprintf( &buffer, "%sContent-Type: application/x-www-form-urlencoded\r\n", buffer );
+ asprintf( &buffer, "%sContent-Length: %i\r\n\r\n", buffer, content_len );
+ asprintf( &buffer, "%s%s%s", buffer, http_post_data, "\r\n" );
+ sendsize = SSL_write( ssl, buffer, strlen( buffer ) );
+ switch ( SSL_get_error( ssl, sendsize ) ) {
+ case SSL_ERROR_NONE:
+ if ( sendsize < strlen( buffer ) )
+ ssl_terminate( STATE_CRITICAL, "SSL ERROR: Incomplete write.\n" );
+ break;
+ default:
+ ssl_terminate( STATE_CRITICAL, "SSL ERROR: Write problem.\n" );
+ break;
+ }
+ /* or just a newline */
+ } else {
+
+ asprintf( &buffer, "%s\r\n", buffer );
+ sendsize = SSL_write( ssl, buffer, strlen( buffer ) );
+ switch ( SSL_get_error( ssl, sendsize ) ) {
+ case SSL_ERROR_NONE:
+ if ( sendsize < strlen( buffer ) )
+ ssl_terminate( STATE_CRITICAL, "SSL ERROR: Incomplete write.\n" );
+ break;
+ default:
+ ssl_terminate( STATE_CRITICAL, "SSL ERROR: Write problem.\n" );
+ break;
+ }
+ }
+
+
+ /* read server's response */
+
+ do {
+ recvsize = SSL_read( ssl, recvbuff, MAX_INPUT_BUFFER - 1 );
+
+ switch ( SSL_get_error( ssl, recvsize ) ) {
+ case SSL_ERROR_NONE:
+ if ( recvsize > (size_t) 0 ) {
+ recvbuff[recvsize] = '\0';
+ asprintf( &content, "%s%s", content, recvbuff );
+ size += recvsize;
+ }
+ break;
+ case SSL_ERROR_WANT_READ:
+ if ( use_client_certificate ) {
+ continue;
+ } else {
+ // workaround while we don't have anonymous client certificates: return OK
+ //ssl_terminate( STATE_WARNING, "HTTPS WARNING - Client Certificate required.\n" );
+ ssl_terminate( STATE_OK, "HTTPS WARNING - Client Certificate required.\n" );
+ }
+ break;
+ case SSL_ERROR_ZERO_RETURN:
+ break;
+ case SSL_ERROR_SYSCALL:
+ ssl_terminate( STATE_CRITICAL, "SSL ERROR: Premature close.\n" );
+ break;
+ default:
+ ssl_terminate( STATE_CRITICAL, "SSL ERROR: Read problem.\n" );
+ break;
+ }
+ } while ( recvsize > (size_t) 0 );
+
+ asprintf( &page->content, "%s", content );
+ page->size = size;
+
+ /* return a CRITICAL status if we couldn't read any data */
+ if ( size == (size_t) 0)
+ ssl_terminate( STATE_CRITICAL, "No data received" );
+
+ return STATE_OK;
+}
+#endif
+
+
+#ifdef HAVE_SSL
+int
+ssl_terminate(int state, char *string ) {
+ ERR_print_errors( bio_err );
+ terminate( state, string );
+}
+#endif
+
+#ifdef HAVE_SSL
+static int
+password_cb( char *buf, int num, int rwflag, void *userdata )
+{
+ if ( num < strlen( client_certificate_passphrase ) + 1 )
+ return( 0 );
+
+ strcpy( buf, client_certificate_passphrase );
+ return( strlen( client_certificate_passphrase ) );
+}
+#endif
+
+#ifdef HAVE_SSL
+static void
+sigpipe_handle( int x ) {
+}
+#endif
+
+#ifdef HAVE_SSL
+SSL_CTX *
+initialize_ssl_ctx( void )
+{
+ SSL_METHOD *meth;
+ SSL_CTX *ctx;
+
+ if ( !bio_err ) {
+ /* Global system initialization */
+ SSL_library_init();
+ SSL_load_error_strings();
+
+ /* An error write context */
+ bio_err=BIO_new_fp( stderr, BIO_NOCLOSE );
+ }
+
+ /* set up as SIGPIPE handler */
+ signal( SIGPIPE, sigpipe_handle );
+
+ /* create our context */
+ meth=SSLv3_method();
+ ctx=SSL_CTX_new( meth );
+
+ /* load client certificate and key */
+ if ( use_client_certificate ) {
+ if ( !(SSL_CTX_use_certificate_chain_file( ctx, client_certificate_file )) )
+ ssl_terminate( STATE_CRITICAL, "check_http: can't read client certificate file" );
+
+ /* set client certificate key passphrase */
+ if ( use_client_certificate_passphrase ) {
+ SSL_CTX_set_default_passwd_cb( ctx, password_cb );
+ }
+
+ if ( !(SSL_CTX_use_PrivateKey_file( ctx, client_certificate_file, SSL_FILETYPE_PEM )) )
+ ssl_terminate( STATE_CRITICAL, "check_http: can't read client certificate key file" );
+ }
+
+ /* load the CAs we trust */
+ if ( use_ca_certificate ) {
+ if ( !(SSL_CTX_load_verify_locations( ctx, ca_certificate_file, 0 )) )
+ ssl_terminate( STATE_CRITICAL, "check_http: can't read CA certificate file" );
+
+#if (OPENSSL_VERSION_NUMBER < 0x00905100L)
+ SSL_CTX_set_verify_depth( ctx, 1 );
+#endif
+ }
+
+ return ctx;
+}
+#endif
+
+#ifdef HAVE_SSL
+void destroy_ssl_ctx( SSL_CTX *ctx )
+{
+ SSL_CTX_free( ctx );
+}
+#endif
+
+#ifdef HAVE_SSL
+int
+fetch_server_certificate( SSL *ssl )
+{
+ server_certificate = SSL_get_peer_certificate( ssl );
+ if ( server_certificate == NULL )
+ ssl_terminate( STATE_CRITICAL, "SSL ERROR: Cannot retrieve server certificate.\n" );
+
+ return STATE_OK;
+}
+#endif
+
+
+#ifdef HAVE_SSL
+int
+check_server_certificate_chain( SSL *ssl )
+{
+ if ( SSL_get_verify_result( ssl ) != X509_V_OK )
+ ssl_terminate( STATE_CRITICAL, "SSL ERROR: Cannot verify server certificate chain.\n" );
+
+ return STATE_OK;
+}
+#endif
+
+
+#ifdef HAVE_SSL
+int
+check_server_certificate_hostname( )
+{
+ char server_CN[256];
+ char *msg = NULL;
+ X509_NAME_get_text_by_NID( X509_get_subject_name( server_certificate ), NID_commonName, server_CN, 256 );
+ if ( strcasecmp( server_CN, server_hostname ) ) {
+ asprintf( &msg, "SSL ERROR: Server Certificate does not match Hostname %s.\n", server_hostname );
+ ssl_terminate( STATE_WARNING, msg );
+ }
+
+ return STATE_OK;
+}
+#endif
+
+#ifdef HAVE_SSL
+int
+check_server_certificate_expires( )
+{
+ ASN1_STRING *tm;
+ int offset;
+ struct tm stamp;
+ int days_left;
+ char timestamp[17] = "";
+ char *msg = NULL;
+
+ /* Retrieve timestamp of certificate */
+ tm = X509_get_notAfter( server_certificate );
+
+ /* Generate tm structure to process timestamp */
+ if ( tm->type == V_ASN1_UTCTIME ) {
+ if ( tm->length < 10 ) {
+ ssl_terminate( STATE_CRITICAL, "ERROR: Wrong time format in certificate.\n" );
+ } else {
+ stamp.tm_year = ( tm->data[0] - '0' ) * 10 + ( tm->data[1] - '0' );
+ if ( stamp.tm_year < 50 )
+ stamp.tm_year += 100;
+ offset = 0;
+ }
+ } else {
+ if ( tm->length < 12 ) {
+ ssl_terminate( STATE_CRITICAL, "ERROR: Wrong time format in certificate.\n" );
+ } else {
+ stamp.tm_year =
+ ( tm->data[0] - '0' ) * 1000 + ( tm->data[1] - '0' ) * 100 +
+ ( tm->data[2] - '0' ) * 10 + ( tm->data[3] - '0' );
+ stamp.tm_year -= 1900;
+ offset = 2;
+ }
+ }
+ stamp.tm_mon =
+ ( tm->data[2 + offset] - '0' ) * 10 + ( tm->data[3 + offset] - '0' ) - 1;
+ stamp.tm_mday =
+ ( tm->data[4 + offset] - '0' ) * 10 + ( tm->data[5 + offset] - '0' );
+ stamp.tm_hour =
+ ( tm->data[6 + offset] - '0' ) * 10 + ( tm->data[7 + offset] - '0' );
+ stamp.tm_min =
+ ( tm->data[8 + offset] - '0' ) * 10 + ( tm->data[9 + offset] - '0' );
+ stamp.tm_sec = 0;
+ stamp.tm_isdst = -1;
+
+ days_left = ( mktime( &stamp ) - time( NULL ) ) / 86400;
+ snprintf
+ ( timestamp, 17, "%02d.%02d.%04d %02d:%02d",
+ stamp.tm_mday, stamp.tm_mon +1, stamp.tm_year + 1900,
+ stamp.tm_hour, stamp.tm_min );
+
+ if ( ( days_left > 0 ) && ( days_left <= server_certificate_min_days_valid ) ) {
+ asprintf( &msg, "Certificate expires in %d day(s) (%s).\n", days_left, timestamp );
+ ssl_terminate( STATE_WARNING, msg );
+ }
+ if ( days_left < 0 ) {
+ asprintf( &msg, "Certificate expired on %s.\n", timestamp );
+ ssl_terminate( STATE_CRITICAL, msg );
+ }
+
+ if (days_left == 0) {
+ asprintf( &msg, "Certificate expires today (%s).\n", timestamp );
+ ssl_terminate( STATE_WARNING, msg );
+ }
+
+ asprintf( &msg, "Certificate will expire on %s.\n", timestamp );
+ ssl_terminate( STATE_OK, msg );
+}
+#endif
+
+/* written by lauri alanko */
+static char *
+base64 (char *bin, int len)
+{
+
+ char *buf = (char *) malloc ((len + 2) / 3 * 4 + 1);
+ int i = 0, j = 0;
+
+ char BASE64_END = '=';
+ char base64_table[64] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+
+ while (j < len - 2) {
+ buf[i++] = base64_table[bin[j] >> 2];
+ buf[i++] = base64_table[((bin[j] & 3) << 4) | (bin[j + 1] >> 4)];
+ buf[i++] = base64_table[((bin[j + 1] & 15) << 2) | (bin[j + 2] >> 6)];
+ buf[i++] = base64_table[bin[j + 2] & 63];
+ j += 3;
+ }
+
+ switch (len - j) {
+ case 1:
+ buf[i++] = base64_table[bin[j] >> 2];
+ buf[i++] = base64_table[(bin[j] & 3) << 4];
+ buf[i++] = BASE64_END;
+ buf[i++] = BASE64_END;
+ break;
+ case 2:
+ buf[i++] = base64_table[bin[j] >> 2];
+ buf[i++] = base64_table[((bin[j] & 3) << 4) | (bin[j + 1] >> 4)];
+ buf[i++] = base64_table[(bin[j + 1] & 15) << 2];
+ buf[i++] = BASE64_END;
+ break;
+ case 0:
+ break;
+ }
+
+ buf[i] = '\0';
+ return buf;
+}
+
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-23 10:46:35 +0000